doc: add vmTools
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Leandro Reina
Leandro Emmanuel Reina Kiperman
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<xi:include href="special/makesetuphook.section.xml" />
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<xi:include href="special/mkshell.section.xml" />
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<xi:include href="special/darwin-builder.section.xml" />
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<xi:include href="special/vm-tools.section.xml" />
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</chapter>
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116
doc/builders/special/vm-tools.section.md
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doc/builders/special/vm-tools.section.md
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# vmTools {#sec-vm-tools}
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A set of VM related utilities, that help in building some packages in more advanced scenarios.
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## `vmTools.createEmptyImage` {#vm-tools-createEmptyImage}
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A bash script fragment that produces a disk image at `destination`.
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### Attributes
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* `size`. The disk size, in MiB.
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* `fullName`. Name that will be written to `${destination}/nix-support/full-name`.
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* `destination` (optional, default `$out`). Where to write the image files.
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## `vmTools.runInLinuxVM` {#vm-tools-runInLinuxVM}
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Run a derivation in a Linux virtual machine (using Qemu/KVM). By default, there is no disk image; the root filesystem is
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a `tmpfs`, and the nix store is shared with the host (via the 9P protocol). Thus, any pure Nix derivation should run
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unmodified.
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If the build fails and Nix is run with the `-K` option, a script `run-vm` will be left behind in the temporary build
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directory that allows you to boot into the VM and debug it interactively.
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### Attributes
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* `preVM` (optional). Shell command to be evaluated *before* the VM is started (i.e., on the host).
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* `memSize` (optional, default `512`). The memory size of the VM in megabytes.
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* `diskImage` (optional). A file system image to be attached to `/dev/sda` (Note that currently we expect the image to
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contain a filesystem, not a full disk image with a partition table etc).
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### Examples
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```nix
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# Build the derivation hello inside a VM
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runInLinuxVM hello
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# Build inside a VM with extra memory
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runInLinuxVM (hello.overrideAttrs (_: { memSize = 1024; }))
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# Use VM with a disk image (implicitly sets `diskImage`, see `vmTools.createEmptyImage`)
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runInLinuxVM (hello.overrideAttrs (_: { preVM = createEmptyImage { size = 1024; fullName = "vm-image"; }; }))
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```
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<!-- TODO
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## `vmTools.extractFs` {#vm-tools-extractFs}
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## `vmTools.extractMTDfs` {#vm-tools-extractMTDfs}
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-->
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## `vmTools.runInLinuxImage` {#vm-tools-runInLinuxImage}
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Like [](#vm-tools-runInLinuxVM), but run the build not using the `stdenv` from the Nix store, but using the tools
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provided by `/bin`, `/usr/bin`, etc. from the specified filesystem image, which typically is a filesystem containing a
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non-NixOS Linux distribution.
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## `vmTools.makeImageTestScript` {#vm-tools-makeImageTestScript}
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Generate a script that can be used to run an interactive session in the given image.
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### Examples
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```nix
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# Create a script for running a Fedora 27 VM
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makeImageTestScript diskImages.fedora27x86_64
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# Create a script for running an Ubuntu 20.04 VM
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makeImageTestScript diskImages.ubuntu2004x86_64
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```
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## `vmTools.diskImageFuns` {#vm-tools-diskImageFuns}
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A set of functions that build a predefined set of minimal Linux distributions images.
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### Images
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* Fedora
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* `fedora26x86_64`
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* `fedora27x86_64`
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* CentOS
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* `centos6i386`
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* `centos6x86_64`
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* `centos7x86_64`
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* Ubuntu
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* `ubuntu1404i386`
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* `ubuntu1404x86_64`
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* `ubuntu1604i386`
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* `ubuntu1604x86_64`
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* `ubuntu1804i386`
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* `ubuntu1804x86_64`
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* `ubuntu2004i386`
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* `ubuntu2004x86_64`
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* Debian
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* `debian9i386`
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* `debian9x86_64`
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* `debian10i386`
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* `debian10x86_64`
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### Attributes
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* `size` (optional, defaults to `4096`). The size of the image, in megabytes.
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* `extraPackages` (optional). A list names of additional packages from the distribution that should be included in the
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image.
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### Examples
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```nix
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# 8G image containing Firefox in addition to the default packages.
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diskImageFuns.ubuntu2004x86_64 { extraPackages = [ "firefox" ]; size = 8192; }
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```
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## `vmTools.diskImageExtraFuns` {#vm-tools-diskImageExtraFuns}
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Shorthand for `vmTools.diskImageFuns.<attr> { extraPackages = ... }`.
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## `vmTools.diskImages` {#vm-tools-diskImages}
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Shorthand for `vmTools.diskImageFuns.<attr> { }`.
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@ -3,6 +3,7 @@
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"mpd(1)": "https://mpd.readthedocs.io/en/latest/mpd.1.html",
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"mpd.conf(5)": "https://mpd.readthedocs.io/en/latest/mpd.conf.5.html",
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"nix.conf(5)": "https://nixos.org/manual/nix/stable/command-ref/conf-file.html",
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"mount(5)": "https://linux.die.net/man/8/mount",
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"journald.conf(5)": "https://www.freedesktop.org/software/systemd/man/journald.conf.html",
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"logind.conf(5)": "https://www.freedesktop.org/software/systemd/man/logind.conf.html",
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